Each colony was then treated with formic acid for a period of 9 days, i.e. 3 doses of 20 ml 60% acid at 3 day intervals. As described in Varroa 3 in the menu above).
The total mite drop in each colony was:
A 5, B 0, C 7, D 2, E 30, F 3 in this time. No mites dropped on the final two days of treatment in any of the colonies.

During the treatment no difference in the behaviour of the bees was noticed. The bees continued to forage normally.

In colony E where most mites were seen the daily mite drop over this 9 day period was :
9,15, 2, 4, 0, 0, 0, 0, 0.